Free Body Fat Percentage Calculator
Estimate your body fat percentage using the US Navy method — a clinically validated formula based on body circumference measurements. Track your body composition changes on GLP-1 treatment.
Understanding Your Body Fat
Body fat percentage is a crucial health metric that provides insights beyond what weight alone can tell you
Health Assessment
Better indicator of health risks than weight alone
Fitness Level
Understand your body composition and fitness progress
Goal Setting
Set realistic and healthy body composition goals
Progress Tracking
Monitor changes in body composition over time
Calculate Your Body Fat
Already know you want to lose fat? Skip the measurements and start your free eligibility screening.
Start Screening — 2 MinutesBody Fat Categories
GLP-1s Target Fat Loss
GLP-1 medications like semaglutide and tirzepatide promote preferential fat loss over muscle loss — something traditional diets often fail to achieve. Patients typically see significant reductions in body fat percentage within the first 3 months.
See If I QualifyMeasurement Tips
- Measure in the morning before eating
- Use a flexible measuring tape
- Keep the tape snug but not tight
- Take measurements 3 times and use the average
About Body Fat Percentage
Understanding the science behind body fat measurement and its importance for your health
Why It Matters
Body fat percentage is a better indicator of health than weight alone. It shows the proportion of fat versus lean mass in your body, helping you understand your fitness level and health risks.
This measurement helps identify potential health issues and guides effective fitness and nutrition strategies.
U.S. Navy Method
This calculator uses the U.S. Navy method, which is considered one of the most accurate methods for estimating body fat percentage without specialized equipment.
Developed by the military for fitness assessments, this method has been validated through extensive research.
Important Limitations
While this method is fairly accurate, it may not be suitable for everyone. Athletes with high muscle mass or individuals with certain body types may get less accurate results.
For the most accurate measurements, consider professional body composition analysis methods like DEXA scans.
Track Your Body Composition on Treatment
GLP-1 patients who track body fat percentage see better long-term results than those who only track scale weight. Our patients lose 15–20% of total body weight, mostly from fat mass.
Important Health Notice
• This calculator provides estimates and should not replace professional medical advice
• Consult with healthcare providers before making significant changes to diet or exercise
• Individual results may vary based on factors like age, genetics, and medical conditions
• Focus on overall health and wellness rather than just body fat percentage numbers
Related Health Tools
Explore our comprehensive suite of health and fitness calculators
Your Body Composition Can Change — Fast
GLP-1 medications help patients lose 15–20% of their body weight, primarily from fat mass, within 6 months. The screening takes 2 minutes. If approved, medication ships same-day.